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| 1 |
Leaves including petiole glabrous. |
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14 E. elliptica |
| + |
Leaves pubescent, petiole pubescent or glabrous. |
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(2) |
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| 2 (1) |
Leaves abaxially sparsely pubescent or rusty or gray tomentose. |
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(3) |
| + |
Leaves brown or brownish yellow tomentose when young, glabrescent. |
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(7) |
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| 3 (2) |
Leaf margin remotely 4–10-serrate apically, entire basally. |
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(4) |
| + |
Leaf margin remotely serrate or undulate, entire basally. |
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(5) |
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| 4 (3) |
Leaves abaxially initially rusty pubescent, glabrescent; flowers large, stalked, petals 6–8 mm, entire at apex. |
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4 E. tengyuehensis |
| + |
Leaves abaxially yellow villous; flowers small, stalked or sessile, petals ca. 5 mm, truncate, slightly emarginate, or 2-lobed at apex. |
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5 E. salwinensis |
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| 5 (3) |
Leaf margin undulate, blade 7–15 cm; styles 2, rarely 3. |
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3 E. prinoides |
| + |
Leaf margin remotely serrate, blade 12–40 cm; styles 3–5. |
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(6) |
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| 6 (5) |
Leaf blade lanceolate, oblanceolate, obovate, or elliptic-oblong, 12–30 × 3–9 cm, adaxially rugose, abaxially densely grayish brown tomentose; styles 5. |
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1 E. japonica |
| + |
Leaf blade oblong to oblong-obovate, 30–40 × 10–15 cm, adaxially not rugose, abaxially densely rusty tomentose; styles 3–5. |
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2 E. malipoensis |
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| 7 (2) |
Leaf margin remotely inconspicuously serrate apically, entire basally. |
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6 E. fragrans |
| + |
Leaf margin serrate along entire length. |
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(8) |
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| 8 (7) |
Petiole ca. 1.5 cm or less. |
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(9) |
| + |
Petiole 1.5 cm or longer. |
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(10) |
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| 9 (8) |
Stamens 10; styles 2; leaf blade lanceolate or oblanceolate, very rarely ovate-oblong, apex acute, margin remotely sharply serrate. |
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12 E. henryi |
| + |
Stamens 15; styles 3 or 4; leaf blade oblong or obovate-oblong, apex obtuse or acute, margin incurved-serrate. |
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13 E. seguinii |
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| 10 (8) |
Leaf blade obovate or oblanceolate. |
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(11) |
| + |
Leaf blade oblong, elliptic, oblong-lanceolate, oblong-oblanceolate, or lanceolate. |
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(12) |
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| 11 (10) |
Flowers sessile; styles 3 or 4; leaf blade 9–23 × 3.5–13 cm. |
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7 E. serrata |
| + |
Flowers pedicellate, pedicel 2–4 mm; styles 2 or 3; leaf blade 5–15 × 2–6 cm. |
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8 E. obovata |
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| 12 (10) |
Leaf margin incised-serrate; peduncle and pedicels tomentose. |
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9 E. bengalensis var. angustifolia |
| + |
Leaf margin serrate or crenate; peduncle and pedicels subglabrous or rusty tomentose. |
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(13) |
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| 13 (12) |
Leaf margin shallowly but sharply serrate, not revolute; peduncle and pedicels sparsely pubescent or subglabrous. |
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10 E. cavaleriei |
| + |
Leaf margin coarsely obtusely serrate and revolute; peduncle and pedicels densely rusty tomentose. |
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11 E. deflexa |
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